18626769520 has 20 divisors (see below), whose sum is σ = 43307239320. Its totient is φ = 7450707776.

The previous prime is 18626769509. The next prime is 18626769521. The reversal of 18626769520 is 2596762681.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18626769521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116417230 + ... + 116417389.

It is an arithmetic number, because the mean of its divisors is an integer number (2165361966).

Almost surely, 2^18626769520 is an apocalyptic number.

18626769520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18626769520 is an abundant number, since it is smaller than the sum of its proper divisors (24680469800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18626769520 is a wasteful number, since it uses less digits than its factorization.

18626769520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232834632 (or 232834626 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 52.

The spelling of 18626769520 in words is "eighteen billion, six hundred twenty-six million, seven hundred sixty-nine thousand, five hundred twenty".